Method of making piston rings



H-- C. DOAN AND C. J. MARSON.

METHOD OF MAKING PISTON nmes.

APPLICATION FILED MAR. 11, I920.

ws mg, Patented Nov. 141, 1922.

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RRY C. DOAN AND CLIFFORD J'. MARSQN, OF RICHMOND, INDIANA, ASSIGNORS TO 1 D & AUTQP ARTS 00., OERIOHMOND, INDIANA, A CORPORATION INDIANA.

METHOD OF MAKING PISTON RINGS.

Application filed March 11, 1920. Serial No. 364,965.

the wear thereof will be reduced to a mini-- mum, in which the life of the ring will be greatly increased, and in which its resiliency will be constantly maintained, and which can be manufactured and sold at a comparatively lowprice. It is a well lmown fact that piston rings are usually formed of porous metal, such as gray-iron, and that in a short time the pores thereof become saturated or filled with oil, thereby causing the ring to become dead and deteriorate, whereby its resiliency gradually diminishes until it has to be replaced with .a new ring. Therefore, the primal I object of our pres'entlinvention is to overcome these objections, thereby at least greatly prolonging the usefulness and the efliciency of t e ring.-

The preferred manner of carrying out the I objects of our invention in a practical and economical manner is shown in the accon1- panymdrawings, in which Figural shows a side e evation of-aiston with two of, om"

'4 ring, the same being taken at an angle dif ferent from that shown in Fig. 2; And

- Figure his a cross section. of one of our rings, as taken on'a greatly enlarged scale.

' Similar indi'cesdenote' like parts throughout the severaL views. v

In order that the construction and the advantages of our invention may be more fully understood and appreciated we. will now take up adetailed description thereof.

F ormed around ih'the peripheral wall of Referring now to the drawings in detail:

the piston are a plurality of channels, each being adaptedto receive one of our rings.

Each of our rings comprises a body por tion'2, which is formed of any suitable material, such for instance as gray iron, the same being formed substantially square in cross section.

Covering one edge of the body 2 is the plating 3, covering the other edge of the body 2 is the plating 4r,'3.-11d' covering the inner periphery of the body 2 is the plating 5. The said plating 3, 4 and 5 is formed of metal difi'erent in character from that of the body 2, the same being formed, preferably, of fcopper ,or an alloy.

The body 2 is usually formed of porous metal, such as cast or gray iron, having the proper degree of resiliency, while the plating is formed of a dense metal, such as copper or the like which is adapted to be carried in suspension in liquid form until it is applied to the body 2 whichis usually done electrically. I Formed in'the face or periphery of the body 2 is an oil groove 6 which, when the piston is in operative position, is closed by the'wall of the cylinder in which the piston operates.

Thus it will be seen that the outer periphery of the ring is adapted to slide in contact with the Wall of a cylinder, while the plating 3 and 4 contacts with the upper and the lower walls of the channel 7 in which the ring is located in the usual manner.

The method or process of forming our piston rings consists in forming the body 2 in the .usual manner, but slightly less in dimensions, after being dressed or machined the body is then subjected to a plating treatment, usually by means of an electro bath,

whereby the body becomes covered with the copper plating, during which the copper also penetrates the interstices of the body 2 and isabsorbed thereby, thus causing the body to become dense without loosing its resiliency and therefore making it impervious to oil. After the-above the outer periphery of .the body is dressed or machined, which re moves the copper plating therefromand also adapts the ring'to fit the wall of a cylinder,

thereby completing the ring and making it for use in the usual manner.

e have found in practice-that by reason not - of the body of the ring being nonporous bythe injection of cop r that the iron will be preserved from d terioration and-the resiliency ofthe ring will be permanently maintained. 1 c

It is to be understood that we do not limit the body ofthe ring to gra' -i ron or even to any kind of iron,- neither 0 we limitithe plating to copper, as other materials may be employed under'certain conditions, "but we do' claim that the materials mentioned are the best found thus far.

Having now fully shownvand described: our invention what we claim, and desire to secure by Letters Patent of the United States, is-

The herein described method of forming 5 piston rings, which consistsof forming the body of the ring of 4 porous to the desired shape,

described. 1

In' testimony whereof we' have hereunto gray-ironcast machining the surfaces of the body whereby the size of the ring in cross section will be less than the. required size of the completed ring,

the metal of the covering the edges and the inner periphery of the body and smOoth'Surface-and whereby the ring will be reduced to the lproper dimensions required, all substantia shown and subscribed our-names to this specification in the presence of two subscribin RY C. DOA s v CLIFFORD J. MABSON. Witnesses:

'RoB'r. W. HANDLE,

R. E. RANDLE;

witnesses. 

